Improved machine for indicating carpenters  squares



H. JONES.

Machine for Indicating Carpenters Squares.

1 Patented Jany 31,1865.

Inventor:

I HI

Witnesses.

N. PErERs. Photo-Lithograph UNITED STATES PATENT OFFICE.

HORACE K. JONES, OF KENSINGTON, CONNECTICUT, ASSIGNOR TO THE HARTMANUFACTURING COMPANY, OF SAME PLACE.

IMPROVED MACHINE FOR INDICATING CARPENTERS SQUARES.

Specification forming part of Letters Patent No. 46,19 I dated January3], 1865.

To all whom it may concern.-

Be it known that l, HORACE K. JoN s, of Kensington, in the county ofHartford and State of Connecticut, have invented a new and ImprovedMachine for Indicating Carpenters Squares, &c.; and I do hereby declarethat the following is a full, clear, and exact description thereof,which will enable those skilled in the art to make and use the same,reference being had to the accompanying drawings, forming part of thisspecification, in which- Figure 1 represents a transverse verticalsection of my invention, taken in the plane indicated by the line 00 m,Fig. 2. Fig. 2 is a plan or top view of the same. Fig. 3 is a detachedsectional view of one of the yielding beds, showing themanner in whichthe gravers are fastened.

Similar letters of reference indicate corresponding parts.

This invention consists in the use, in a machine for indicatingcarpenters squares, &c., of a series of gravers arranged on thecircumference of a roller or cylinder, and capable of making marks ofdifi'erent lengths also, in combiningwith each graver a toe and yieldingbed for the purpose of governing the length (If the marks to be made;finally, in a clamp acting as a gage to regulate the depth of the outand to confine the graver.

A represents a cylindrical roller or drum, made of cast-iron or anyother suitable materiahjand mounted on an axle, O, which has itsbearings in a frame, B. This roller is provided with a series of'yielding beds, D, to which the gravers a are firmly attached. Said beds arefitted into cavities in the circumference of the roller, and they arehinged to the same by pivots b, as shown in the drawings; or they may beconnected to the roller in any other convenient manner so that they willyield when exposed to an external pressure. Suitable springs, c, forceout'the loose ends of these beds as far as the set-screws (1 will allow,and

these setscrews pass freely through counter.

sunk holes in the beds and screw firmly into the body of the roller, sothat their heads do not project above the circumference of the same, andthe position of the beds can be adjusted at pleasure. Is it obvious thatthe beds, instead of being connected to the roller by pivots, might bemade to slide in and out in suitable ways, or they might be connected toit in any other suitable manner; and I do not wish to confine myself,therefore, to the precise arrangement hereinbefore described, and shownin the drawings, but reserve the right to make any desirable change inthis arrangement. Each bed is provided with a dovetailed recess, 6, toreceive one of the cutters or gravers a, and these gravers are made witha triangular cross-section, as clearly shown in Fig. 3, and they areretained by screw-clamps g. These clamps consist of simple plates, whichare secured to the beds by suitable screws, and by the position of thepoint of the graver in relation to the outer edge of saidclamping-plates the depth of the cut is determined. By making thegravers with a triangular cross-section I am enabled to keep thecutting-point sharp without much trouble or loss of time, and to holdthe gravers in position with ease and facility. It must be remarked,however, that I do not wish to confine myself to this precise shape ofgravers,

but I reserve the right to change their form as I may see fit. Theroller A is situated over the bed or platform E, which is intended tosupport the square or other article to be indicated, and said platformis provided with a shoulder, h, to retain the square orother article inposition while the gravers take action. If desired, this platform or bedmay be made adjustable, so that it will accommodate itself to thevariable thickness of the blade or square to be indicated. The length ofthe marks made by the several gravers is governed by a series of t'oes,i, one of which projects from the outer surface of each of the yieldingbeds D, and in each individual case the length of the mark depends uponthe distance of the toe from the pivot on which the bed swings, or fromthe point of the graver.

In rotating the roller the toes i come in contact with the teeth orprojections j of a notched bar, F, which is secured to the frame A onthe side of the roller, as clearly shown in Figs. 1 and 2 of thedrawings. As long as the toe projecting from one of the beds is incontact with one of the projections j, the bed is pressed in, and thegraver attached to it is prevented coming in contact with the surface tobe indicated, and not until the toe has passed'said projection is thegraver allowed to take action. It is obvious that the sooner the gravercommences to act the longer will be the mark produced, and consequentlyif the toe is placed close to the point of said graver, so that it willrelieve the bed nearly at the same moment when the point has passed theinner edge of the notched plate, the mark produced will be longer thanit will be when the toe commences to press back the yielding bed afterthe point of the graver is nearly on the point of passing the notchedplate.

By making the notched plate adjustable backward and forward the lengthof the marks may be still further regulated, so that marks for inches,half-inches, quarter-inches, and sixteenths can be made with one and thesame graver.

By this machine the operation of indicating carpenters squares can becarried on with the greatest nicety and accuracy, the number of marksmade for each revolution of the roller can be increased or decreased atpleasure, and the length of the marks made by each graver can be easilyadjusted, according to the width of the blade on which the scale is tobe produced.

By increasing the diameter of the cylinder it may be made large enoughto contain as many gravers as there are marks upon one edge of thesquare, each graver making but one mark, and the whole being completedat one revolution of the cylinder.

-I claim as new and desire to secure by Letters Patent- 1. The method,substantially as described, for cutting the division-marks on carpenterssquares and rules.

2. T] e toes i and yielding beds D, in combination with the gravers a,applied and operating substantially as and for the purpose set forth.

3. The screw-clamps g, applied in combination with the gravers a,substantially as herein specified, for the purpose of holding them intheir places and to govern the depth of the cuts.

1 HORACE K. JONES. Witnesses:

E. B. HOTOHKISS, J OHN UPSON.

